Fix for splitting dates

dmnverifierapi/src/main/java/de/unikoblenz/fgbks/core/dmn/verification/verifier/impl/DateVerifier.java

@@ -40,14 +40,15 @@ public class DateVerifier extends AbstractVerifier {
 
   private void checkDateValue(VDmnValue dateValue) {
     if (!dateValue.getText().isEmpty()) {
-      for (String dateStringValue :
+      String[] vals =
           dateValue
               .getText()
               .replace("<", "")
               .replace(">", "")
               .replace("[", "")
               .replace("]", "")
-              .split("..")) {
+              .split("\\.\\.");
+      for (String dateStringValue : vals) {
         checkCorrectDate(dateValue, dateStringValue);
       }
     }